MILWAUKEE (AP) -- State transportation officials are warning motorists to watch out for buckling roads as the heat wave drags on.

According to the National Weather Service, highs are expected in the 90s in the northern part of Wisconsin Thursday, with the southern part of the state possibly reaching up to 106.

An excessive heat warning was issued for much of central, southern and western Wisconsin through 10 p.m. Friday. A heat advisory is in effect for northern Wisconsin through 10 p.m. Thursday.

The Department of Transportation says the risk of buckling pavement will be high Thursday and Friday.

The agency says it received reports of 17 pavement buckles on major highways on July 4th alone. Workers were able to make repairs in an average of two to three hours.